Experimental study on the hydro-mechanical behavior of Boom clay

Yu, Hongdan; Chen, Weizhong; Jia, Shanpo; Cao, Junjie; Li, Xiangling

doi:10.1016/j.ijrmms.2012.05.013

Cited by 24 publications

(18 citation statements)

References 23 publications

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“…where ε e is the elastic strain, ε e0 is the mean value of elastic strain, ε p is the equivalent plastic strain, and s 1 and s 2 are correction coefficients. e experimental results of Yu et al [12] show that the damage has obvious influence on the elastic modulus and cohesion, but has little influence on the internal friction angle. According to the Lemaitre strain equivalence principle, the relationship between the strength parameters of rock mass and the damage degradation is obtained:…”

Section: Improved Multifield Coupling Modelmentioning

confidence: 98%

Multiphysics Coupling Model of Rock Mass considering Damage and Disturbance and Its Application

Wang

Luo

Qin

et al. 2018

Advances in Civil Engineering

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Aiming at the deficiency of the conventional multiphysics coupling model, the deterioration of strength parameters was considered by defining elastoplastic damage variables, and the heterogeneity of strength parameters was expressed by the Weibull distribution function. In addition, the relation between effective stress and the anisotropic permeability matrix was established, and the blast was transformed into a load boundary condition. On this basis, an improved multiphysics coupling model that considered damage and disturbance was constructed, while a corresponding finite element calculation program was developed. Taking an excavation stope as the object, the characteristics of the mining-induced stress, seepage, and failure were analyzed by an improved multiphysics coupling model and compared with actual detection data. The results show that the improved model reflects the extent and range of mining-induced failure more accurately and fits well with the actual detection. These results are compared to the conventional multiphysics coupling model and a single physics model. It is indicated that the improved multiphysics coupling model and corresponding calculation program are effective and rational.

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Section: Improved Multifield Coupling Modelmentioning

confidence: 98%

Multiphysics Coupling Model of Rock Mass considering Damage and Disturbance and Its Application

Wang

Luo

Qin

et al. 2018

Advances in Civil Engineering

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“…Sample re-saturation has been done under in-situ effective stress (2.5 MPa) using the same method as described by Yu et al (2012) before permeability measurement. To avoid the presence of any gas, a vacuuming procedure was applied to the sample.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…The saturation time for Boom Clay was approximately 20 days until a satisfactory value of the Skempton coefficient B was obtained. Yu et al (2012) supposed that the Skempton coefficient B would be less than 1.0 for stiff clays. The 7 Skempton coefficient B of Boom Clay samples is stable at approximately 0.85-0.90 after several checkpoints (once a day) and it did not further increase.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

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Variation of the hydraulic conductivity of Boom Clay under various thermal-hydro-mechanical conditions

Chen

et al. 2016

Engineering Geology

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In this paper, an experimental study is presented that intended to investigate (1) the anisotropy properties of hydraulic conductivity of Boom Clay, (2) the effect of heating-cooling cycle on the hydraulic conductivity and intrinsic permeability of Boom Clay, and (3) the effect of loading-unloading cycle on the hydraulic conductivity and intrinsic permeability of Boom Clay. Constant-head tests were carried out in a temperature-controlled triaxial cell. First, the anisotropic characteristic of hydraulic conductivity of Boom Clay with respect to its bedding was confirmed. The horizontal hydraulic conductivity (parallel to bedding) is larger than the vertical hydraulic conductivity (perpendicular to bedding).Second, there was a positive and reversible relationship between the hydraulic conductivity and temperature and a negative and irreversible relationship between the hydraulic conductivity and hydrostatic pressure.Specifically, for both horizontal and vertical hydraulic conductivity, the value at 80 °C is approximately 2.4 times larger than that at room temperature (23 °C). However, it appears that the hydraulic conductivity is not sensitive to heating rate. Data analysis reveals that under variable temperature conditions, the changes in viscosity and density of water with temperature are the main factors affecting the change in hydraulic conductivity of Boom Clay with temperature, although other factors may have an effect to some extent.3

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“…In Belgium, a hard clay has been considered as an ideal geological formation for high-level radioactive nuclear waste disposal in Belgium [1,2], because it has several favourable factors such as low permeability, plasticity, and high retention capacity for radionuclide. The hydromechanical behaviour of the host rock is one of the most important issues in the feasibility studies of the deep geological repository and many studies concerning coupled hydromechanical behaviour and unsaturated behaviour have been carried out [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Suction Cycles and Suction Gradients on the Water Retention Properties of a Hard Clay

Chen

Hua

2015

Advances in Materials Science and Engineering

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The effect of suction cycles and suction gradients on a hard clay is investigated. The cylindrical samples of the hard clay are prepared to carry out the hydration and dehydration tests with different suction gradient and suction cycles. The results show that the suction gradient has little effect on the suction-water content relation, while the suction cycle has great effect on it, particularly the first cycle of hydration and dehydration. The apparent moisture diffusion coefficient of the hard clay has been identified by the use of a two-dimensional diffusion model. The moisture diffusion coefficient varies between 4.10−11 m2/s and 2.10−10 m2/s and it decreases during dehydration while the relative humidity is less than 85%. The results also show that the suction cycles play little effect on the moisture diffusion coefficient.

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Experimental study on the hydro-mechanical behavior of Boom clay

Cited by 24 publications

References 23 publications

Multiphysics Coupling Model of Rock Mass considering Damage and Disturbance and Its Application

Multiphysics Coupling Model of Rock Mass considering Damage and Disturbance and Its Application

Variation of the hydraulic conductivity of Boom Clay under various thermal-hydro-mechanical conditions

Effect of Suction Cycles and Suction Gradients on the Water Retention Properties of a Hard Clay

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